Type 2730, 2731, 2731 K - burkert-usa.com...2731 and 2731 k may be a hazard to people, nearby equipment and the environment. The device is designed for the controlled flow of liquid

Operating InstructionsBedienungsanleitung Manuel d‘utilisation

Type 2730,2731,2731KDN 15 - 50

Piston controlled diaphragm control valve

Kolbengesteuertes Membranregelventil

Vanne de réglage à membrane commandée par piston

We reserve the right to make technical changes without notice.Technische Änderungen vorbehalten.Sous réserve de modifications techniques.

© Bürkert Werke GmbH & Co. KG, 200 - 2017

Operating Instructions 1706/ _EU-EN_008 / Original DE

1 OperatinginstructiOns................................................................41.1 Definition of term “device” ....................................................... 41.2 Symbols ....................................................................................... 4

2 authOrizeduse......................................................................................5

3 BasicsafetyinstructiOns..........................................................5

4 generalinfOrmatiOn........................................................................64.1 Contact address ........................................................................ 64.2 Warranty ...................................................................................... 64.3 Information on the internet ...................................................... 6

5 prOductdescriptiOn........................................................................75.1 General description .................................................................. 75.2 Properties .................................................................................... 75.3 Structure and function.............................................................. 7

6 technicaldata........................................................................................86.1 Conformity ................................................................................... 86.2 Standards .................................................................................... 86.3 Type label .................................................................................... 86.4 Labeling of the forged bodies ................................................ 96.5 Labeling of the tube valve body (VP) .................................... 96.6 Operating conditions ..............................................................106.7 Flow values and characteristics ...........................................166.8 General technical data ...........................................................16

7 installatiOn............................................................................................177.1 Before installation ....................................................................17

7.2 Installation .................................................................................197.3 Pneumatic connection ............................................................20

8 remOval......................................................................................................21

9 electricalcOntrOlunit............................................................ 21

10 malfunctiOns........................................................................................22

11 maintenance...........................................................................................2211.1 Maintenance and cleaning ....................................................2211.2 Replacing the diaphragm ......................................................24

12 replacementparts.......................................................................... 2612.1 Order table ................................................................................27

13 packaging,transpOrt,stOrage.......................................... 28

3

english

Type 2730, 2731 and 2731 K

1 OperaTinginsTrucTiOnsThe operating instructions describe the entire life cycle of the device. Keep these instructions in a location which is easily accessible to every user and make these instructions available to every new owner of the device.

importantsafetyinformation.

Failure to observe these instructions may result in hazardous situations.

▶ The operating instructions must be read and understood.

1.1 Definitionofterm“device”

The term “device” used in these instructions always stands for the diaphragm control valve Type 2730, 2731 and 2731 K.

1.2 symbols

Danger!

Warnsofanimmediatedanger. ▶ Failure to observe the warning may result in a fatal or serious injury.

Warning!

Warnsofapotentiallydangeroussituation. ▶ Failure to observe the warning may result in serious injuries or death.

Caution!

Warnsofapossibledanger. ▶ Failure to observe this warning may result in a moderately severe or minor injury.

note!

Warnsofdamagetoproperty.

Important additional information, tips and recommendations.

Refers to information in these operating instructions or in other documentation.

▶ designates instructions for risk prevention. → designates a procedure which you must carry out.

4

Operatinginstructions

english

Type 2730, 2731 and 2731 K

2 auThOrizeDuse

non-authorizeduseofthediaphragmcontrolvalvetype2730,2731and2731kmaybeahazardtopeople,nearbyequipmentandtheenvironment.

▶ The device is designed for the controlled flow of liquid media. ▶ In the potentially explosion-risk area Type 2730, 2731 and 2731 K may be used only according to the specification on the separate Ex type label. For use observe the additional information enclosed with the device together with safety instructions for the explosion-risk area.

▶ Devices without a separate Ex type label may not be used in a potentially explosive area.

▶ The admissible data, the operating conditions and conditions of use specified in the contract documents, operating instructions and on the label are to be observed during use. The designated application cases are specified in the chapter entitled “5 Product description”.

▶ The device may be used only in conjunction with third-party devices and components recommended and authorised by Bürkert.

▶ Correct transportation, correct storage and installation and care-ful use and maintenance are essential for reliable and faultless operation.

▶ Use the device only as intended.

3 BasicsafeTyinsTrucTiOns

These safety instructions do not make allowance for any • contingencies and events which may arise during the installation,

operation and maintenance of the devices.• local safety regulations, whereby the operator is responsible for their

compliance, by the installation personnel too.

Danger!

danger–highpressure. ▶ Before dismounting the lines and valves, turn off the pressure and vent the lines.

riskofelectricshock. ▶ Before reaching into the device, switch off the power supply and secure to prevent reactivation.

▶ Observe applicable accident prevention and safety regulations for electrical equipment.

riskofinjurywhenopeningtheactuator.The actuator contains a tensioned spring. If the actuator is opened, there is a risk of injury from the spring jumping out!

▶ The actuator must not be opened.riskofburns.The surface of the device may become hot during long-term operation.

▶ Do not touch the device with bare hands.

5

Authorizeduse

english

Type 2730, 2731 and 2731 K

generalhazardoussituations.

To prevent injury, ensure that: ▶ The system cannot be activated unintentionally. ▶ Installation and repair work may be carried out by authorized technicians only and with the appropriate tools.

▶ After an interruption in the power supply or pneumatic supply, ensure that the process is restarted in a defined or controlled manner.

▶ The device may be operated only when in perfect condition and in consideration of the operating instructions.

▶ The general rules of technology apply to application planning and operation of the device.

To prevent damage to property on the device, ensure: ▶ Supply the media connections only with those media which are specified as flow media in the chapter entitled “6 Technical data”.

▶ Do not put any loads on the valve (e.g. by placing objects on it or standing on it).

▶ Do not make any external modifications to the valves. Do not paint the body parts or screws.

4 generalinfOrmaTiOn

4.1 contactaddress

germany

Bürkert Fluid Control Systems Sales Center Christian-Bürkert-Str. 13-17 D-74653 Ingelfingen Tel.: + 49 (0)7940 - 10 91 111 Fax: + 49 (0)7940 - 10 91 448 E-mail: [email protected]

international

Contact addresses are found on the final pages of the printed oper-ating manual.

You can also find information on the Internet under:

www.burkert.com

4.2 Warranty

The warranty is only valid if the device is used as authorized in accor-dance with the specified application conditions.

4.3 informationontheinternet

The operating instructions and data sheets for Type 2730, 2731 and 2731 K can be found on the Internet at: www.burkert.com

6

Generalinformation

english

Type 2730, 2731 and 2731 K

http://www.burkert.com/http://www.burkert.com/COM/buerkert_manuals.php

5 prODucTDescripTiOn

5.1 generaldescription

The piston-controlled diaphragm control valve Type 2730, 2731 and 2731K is suitable for liquid media. Using neutral gases or air (control media), it controls the flow of dirty, aggressive, ultrapure or sterile media, even highly viscous media can be used (flow media). The operation of the diaphragm control valve Type 2730, 2731 and 2731K is possible only in combination with an control unit.

5.2 properties

• Any flow direction.

• Self-draining for appropriate installation. The ends of the utilized connections must be cylindrical.

• Free of empty space.

• Low-turbulence flow.

• High flow values by the streamlined valve body.

• Maintenance-free under normal conditions.

5.2.1 actuatorsizes

The piston-controlled diaphragm control valve is available for the fol-lowing actuator sizes: ø 80 mm, ø 100 mm, ø 125 mm.

5.2.2 pilotpressure

Designs with lower pilot pressure (reduced spring force) are available on request.

5.3 structureandfunction

The operation of the diaphragm control valve Type 2730, 2731 and 2731 K is possible only in combination with an control unit.

Possible control units are: Positioner Type 8635, 8692, 8694, 8792 Process controller Type 8693, 8793

5.3.1 structure

The piston-controlled diaphragm control valve consists of a pneumati-cally operated piston actuator and a 2/2-way valve body.

Actuator cover

Actuator body

Diaphragm socket

Line connection

Valve body

Lower pilot air port

Upper pilot air port

Diaphragm

Fig. 1: Structure and description

7

Productdescription

english

Type 2730, 2731 and 2731 K

5.3.2 function

Spring force (CFA) or pneumatic pilot pressure (CFB) generates the closing force on the diaphragm pressure piece. The force is transferred via a spindle which is connected to the actuator piston.

controlfunctiona(cfa)

Normally closed by spring action

controlfunctionB(cfB)

Normally open by spring action

6 TechnicalDaTa

6.1 conformity

In accordance with the EU Declaration of conformity, the diaphragm control valve Type 2730, 2731 and 2731 K is compliant with the EU Directives.

6.2 standards

The applied standards, which verify conformity with the EU Directives, can be found on the EU-Type Examination Certificate and / or the EU Declaration of Conformity.

6.3 Typelabel

2731 A 25,0 EPDM VA D29 Pmed 10 barPilot 5,5-7 bar 00148320M

ade

in G

erm

any

W14UN

Identification number

Control function

Sealing materialType

Orifice (diaphragm size)

Date of manufacture

Line connection / Permitted medium pressure

Body material

Permitted pilot pressure

Fig. 2: Type label (example)

8

Technicaldata

english

Type 2730, 2731 and 2731 K

6.4 labelingoftheforgedbodies

XXXXXXXXXX

XX F

1.4435/316L(VS)PN16/CWP150

XXXXXXXX/XXX

XXXXXXXXXX Self-drain angle

Customer-specific text (optional)

Orifice connection and pipe dimension

Batch number

Material

Production number / serial number

Nominal pressure

Fig. 3: Labeling of the forged bodies

6.5 labelingofthetubevalvebody(Vp)

1.4435316L(VP) XXXXXXXX

XXXXXXXXXX

PN16 / CWP150

XXXXXXXX / XXXXXXX / XXXXXX

Material HeatCompany logo

Nominal pressure

Connection orifice and pipe dimensions

Self-drain angle / Customer-specific text

(optional)

Production number / serial number

Fig. 4: Labeling of the tube valve body (VP)

9

Technicaldata

english

Type 2730, 2731 and 2731 K

6.6 Operatingconditions

Warning!

riskofinjury,chemicalburns,scaldingduetothedevicerupturingatexcessivelyhighpressure.

▶ Do not exceed the maximum pilot and medium pressure. ▶ Observe permitted ambient and medium temperature. ▶ Observe specifications on the type label.

6.6.1 Temperaturerangespermittedambienttemperatureactuators

actuatorsize actuatormaterial ambienttemperature1)

ø 80 mm

PA, PPS -10 – +60 °Cø 100 mm

ø 125 mm

Tab. 1: Permitted ambient temperature actuators

1) If using a pilot valve / control unit, observe its temperature range.

permittedmediumtemperatureforbody

Plastic body: note that the permissible medium pressure is dependent on the medium temperature (see “Fig. 5: Graph of medium pressure / medium temperature”).

Bodymaterial medium

PVDF (PD) -10 – +120 °C

PP (PP) -10 – +80 °C

PVC (PV) -10 – +60 °C

Tube valve body (VP) 1.4404 (AISI 316L)

-10 – +150 °CCast body (VG) 1.4435 (AISI 316L)

Forged body (VS)1.4435 BN2 (AISI 316L) according to ASME BPE 1997

Tab. 2: Permitted medium temperature for body

permittedmediumtemperaturefordiaphragms

The indicated medium temperatures apply only to media which do not corrode or swell the diaphragm materials.

The behavior of the medium with respect to the diaphragm may be changed by the medium temperature.

The function properties, in particular the service life of the dia-phragm, may deteriorate if the medium temperature increases.

Do not use the diaphragms as steam shut-off element.

material temperature remarks

EPDM (AB) -10...+130 °C Steam sterilisation up to +140 °C / 60 min

EPDM (AD) -5...+143 °C Steam sterilisation up to +150 °C / 60 min

FKM (FF) 0...+130 °C No steam / dry heat up to +150 °C / 60 min

PTFE (EA) -10...+130 °C Steam sterilisation up to +140 °C / 60 min

10

Technicaldata

english

Type 2730, 2731 and 2731 K

material temperature remarks

Advanced PTFE (EU)

-5...+143 °C Steam sterilisation up to +150 °C / 60 min

Advanced PTFE (ET)

-10...+90 °C -

Gylon (ER) -5...+130 °C Steam sterilisation up to +140 °C / 60 min

Tab. 3: Permitted medium temperature for diaphragms

6.6.2 pressurerangespilotpressureforvalveswithpneumaticpositioncontroller

To ensure reliable operation with pneumatic position controller, observe the permitted minimum and maximum pilot pressure!

actuatorsize[mm] pilotpressure

ø 80, ø 100, ø 125 5.5 – 7.0 bar

Tab. 4: Pilot pressure for valves with pneumatic position controller

maximumpilotpressureforvalveswithoutpneumaticpositioncontroller

actuatorsize[mm] actuatormaterialmax.permittedpilotpressure2)

ø 80, ø 100 PA 10 bar

ø 125 PA 7 bar

ø 80, ø 100, ø 125 PPS 7 bar

Tab. 5: Pilot pressure for valves without pneumatic position controller

maximumpilotpressureforvalveswithoutpneumaticpositioncontroller-onlycontrolfunctionBandtubevalvebody(vp)

actuatorsize[mm] actuatormaterialmax.permittedpilotpressure2)

ø 80, ø 100, ø 125 PA, PPS 6 bar

Tab. 6: Maximum pilot pressure for valves without pneumatic position controller - only CFB and tube valve body (VP)

2) Observe the maximum pressure range according to the type label!

mediumpressureforplasticbody

Plastic body: note that the permissible medium pressure is dependent on the medium temperature (see “Fig. 5”).

Medium temperature [°C]

Med

ium

pre

ssur

e [b

ar]

0

2

4

6

8

10

20 40 60 80 100 120 140

pp

pvc

pvdf

Fig. 5: Graph of medium pressure / medium temperature

11

Technicaldata

english

Type 2730, 2731 and 2731 K

Operatingpressureforcontrolfunctiona3)

The values apply to

• Plastic body PVDF (PD), PP (PP), PVC (PV)

• Forged steel body (VS)

• Precision casting body (VG)

• Tube valve body (VP) with ISO weld end connection ISO clamp connection Threaded connection Welded neck flange

act

uato

rsi

ze

[mm

] Ori

fice

dn

(d

iaph

ragm

siz

e)

[mm

]

max.sealedmediumpressure[bar]pressureonone

sidepressureonboth

sides

epdm/fkm ptfe epdm/fkm ptfe

ø 8015 10 10 10 1020 10 10 10 1025 10 7.5 8.5 5.5

ø 100 32 10 8 9 6

ø 12540 10 10 10 950 8 7 7 6

Tab. 7: Operating pressure for control function A


The values apply to

• Tube valve body (VP) with DIN weld end connection DIN clamp connection

act

uato

rsi

ze

[mm

] Ori

fice

dn

(d

iaph

ragm

siz

e)

[mm

]


sidepressureonboth

sides


ø 80

15 10 10 10 1020 10 10 10 1025 10 10 10 932 10 8 7.5 6

ø 100 40 10 8 8 6ø 125 50 10 10 10 8.5


3) The control functions are described in the chapter entitled “5.3.2 Function”.

12

Technicaldata

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Type 2730, 2731 and 2731 K


The values apply to

• Tube valve body (VP) with OD weld end connection BS clamp connection

act

uato

rsi

ze

[mm

] Ori

fice

dn

(d

iaph

ragm

siz

e)

[mm

]


sidepressureonboth

sides


ø 8020 10 10 10 1025 10 10 10 9

ø 100 40 10 8 8 6ø 125 50 10 10 10 8.5


requiredminimumpilotpressuredependingonmediumpressureforcontrolfunctionB.

The values in the following graphs apply to:

• Plastic body PVDF (PD), PP (PP), PVC (PV)

• Forged steel body (VS)

• Precision casting body (VG)

• Tube valve body (VP) with ISO- weld end connection ISO clamp connection Threaded connection Welded neck flange

To protect the diaphragm during control function B, preferably do not select the pilot pressure higher than is required to switch the medium pressure.

controlfunctionB/elastomerdiaphragm

012345678910

0 1 2 3 4 5 6 7 8pilotpressure[bar]

med

ium

pre

ssur

e[b

ar]

ø80epdm

DN

15

DN

20

DN

25

Fig. 6: Pressure graph, actuator ø 80 mm, control function B, elastomer diaphragm

13

Technicaldata

english

Type 2730, 2731 and 2731 K

012345678910


med

ium

pre

ssur

e[b

ar]

ø100,ø125epdm

DN

32

DN

40

DN

50

Fig. 7: Pressure graph, actuator ø 100 mm and ø 125 mm, control function B, elastomer diaphragm

controlfunctionB/ptfediaphragm

012345678910


med

ium

pre

ssur

e[b

ar]

ø80,ø100,ø125ptfe

DN

32D

N40

DN

15

DN

20

DN

25

DN50

Fig. 8: Pressure graph, actuator ø 80 mm, ø 100 mm and ø 125 mm, control function B, PTFE diaphragm


• Tube valve body (VP) with DIN weld end connection DIN clamp connection



012345678910


med

ium

pre

ssur

e[b

ar]

ø80epdm

DN

15

DN

20

DN

25

DN

32


14

Technicaldata

english

Type 2730, 2731 and 2731 K

012345678910


med

ium

pre

ssur

e[b

ar]

ø100,ø125epdm

DN

40

DN

50



012345678910


med

ium

pre

ssur

e[b

ar]


DN

40D

N50

DN

15

DN

20

DN

25

DN

32



• Tube valve body (VP) with OD weld end connection BS clamp connection



012345678910


med

ium

pre

ssur

e[b

ar]

ø80epdm

DN

20D

N25


15

Technicaldata

english

Type 2730, 2731 and 2731 K

012345678910


med

ium

pre

ssur

e[b

ar]

ø100,ø125epdm

DN

40

DN

50



012345678910


med

ium

pre

ssur

e[b

ar]


DN

40D

N50

DN

20

DN

25


6.7 flowvaluesandcharacteristics

Flow values and characteristics for Types 2730, 2731 and 2731 K you find at www.burkert.com → Type 2730.

6.8 generaltechnicaldata

actuatorsizes ø 80 mm, ø 100 mm, ø 125 mm

connections

Pilot air port G1/4, stainless steel

Line connection

Type 2730 Socket and spigot

Type 2731 / 2731K Weld end: in accordance with EN ISO 1127 (ISO 4200), DIN 11850 R2 other connections on request

materials

Body

Type 2730 PVDF (PD), PP (PP), PVC (PV)

Type 2731 Stainless steel precision casting (VG) 1.4435 (AISI 316L), Stainless steel forged steel (VS) 1.4435 (AISI 316L)

Type 2731K Tube valve body (VP) cold-formed 1.4404 (316L)

Actuator PA, PPS

Sealing elements actuator FKM, NBR

16

Technicaldata

english

Type 2730, 2731 and 2731 K

Diaphragm EPDM in food quality, PTFE/EPDM, FKM

media

Control medium Neutral gases, air Quality classes in accordance with DIN ISO 8573-1

Dust content Class 5: max. particle size 40 μm, max. particle density 10 mg/m³

Water content Class 3: max. pressure dew point - 20 °C or min. 10 °C below the lowest operating temperature

Oil content Class 5: max. 25 mg/m³ with TopControl maxi 1 mg/m³ with SideControl

Flow media

Type 2730 Liquids; aggressive or abrasive media

Type 2731 / 2731K Liquids; ultrapure, sterile, aggressive or abrasive media

Viscosity up to viscous

installationposition any position, preferably with the actuator face up

protectionclass IP67 in accordance with IEC 529 / EN 60529

7 insTallaTiOn

Danger!

danger–highpressureintheequipment. ▶ Before loosening the lines and valves, turn off the pressure and vent the lines.

Warning!

riskofinjuryfromimproperinstallation. ▶ Installation may be carried out by authorised technicians only and with the appropriate tools!

riskofinjuryfromunintentionalactivationofthesystemandanuncontrolledrestart.

▶ Secure system from unintentional activation. ▶ Following assembly, ensure a controlled restart.

7.1 Beforeinstallation

• Before connecting the valve, ensure the pipelines are flush.

• The flow direction is optional.

7.1.1 installationpositiongeneral

installationforself-drainageofthebody

It is the responsibility of the installer and operator to ensure self-drainage.

17

Installation

english

Type 2730, 2731 and 2731 K

installationforleakagedetection

One of the bores (in the actuator base) for monitoring leakage must be at the lowest point.

7.1.2 installationposition2/2-wayvalveThe piston-controlled diaphragm control valve can be installed in any installation position, preferably with the actuator face up.To ensure self-drainage:

→ Install body inclined by an angle α = 15° – 35° to the horizontal. → Observe an inclination angle of 1° – 5° to the line axis. Forged and cast body: Mark on the body must point upwards (12 o’clock position, see “Fig. 15”). → One of the bores (in the actuator base) for monitoring leakage must be at the lowest point.

Angle α: 15 °– 35° Inclination to the line axis 1° – 5°

Mark

α

Fig. 15: Installation position for self-drainage of the body

7.1.3 preparatorywork → Clean pipelines (sealing material, swarf, etc.). → Support and align pipelines.

deviceswithvg/vs/vaweldedbody:

note!

damagetothediaphragmortheactuator! ▶ Before welding in the body, remove the actuator.

Remove the actuator from the valve body:

note!

damagetothediaphragmortheseatcontour! ▶ When removing the actuator, ensure that the valve is in open position.

→ Control function A pressurize the lower pilot air port with com-pressed air (5 bar): valve opens. → Remove actuator with diaphragm by loosening the body screws.

Actuator

Valve body



Body screws (4x)

Diaphragm

Fig. 16: Installation

18

Installation

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Type 2730, 2731 and 2731 K

7.2 installation

Warning!

riskofinjuryfromimproperinstallation.Non-observance of the tightening torque is dangerous as the device may be damaged.

▶ Observe the tightening torque (see “Tab. 10: Tightening torques for diaphragms”).

7.2.1 installationofthevalvebodyWeldedbodies

→ Weld valve body in pipeline system.Otherbodyversions

→ Connect body to pipeline.

7.2.2 installationoftheactuator(weldedbody)

installationforactuatorwithcontrolfunctiona:

notiCe!

damagetothediaphragmortheseatcontour! ▶ When installing the actuator, ensure that the valve is in open position.

→ Control function A pressurize the lower pilot air port with com-pressed air (5 bar): valve opens.

→ Lightly cross-tighten the body screws until the diaphragm is between the body and actuator. donottightenthescrewsyet.

→ Actuate the diaphragm control valve twice.

→ Without pressurization tighten the body screws to the permitted tightening torque (see following table “Tab. 10: Tightening torques for diaphragms”).

installationforactuatorwithcontrolfunctionsB:

→ Lightly cross-tighten the body screws without pressurization until the diaphragm is between the body and actuator. donottightenthescrewsyet. → Pressurize upper pilot air port of the actuator with compressed air (5 bar). → Actuate the diaphragm control valve twice. → With pressurization tighten the body screws to the permitted tight-ening torque (see “Tab. 10: Tightening torques for diaphragms”).

Orificedn(diaphragmsize)

tighteningtorquesfordiaphragms[nm]epdm ptfe

15 3.5 420 4 4.525 5 632 6 840 8 1050 12 15

Tab. 10: Tightening torques for diaphragms

19

Installation

english

Type 2730, 2731 and 2731 K

7.3 pneumaticconnection

Danger!


Warning!

riskofinjuryfromunsuitableconnectionhoses.

Hoses which cannot withstand the pressure and temperature range may result in hazardous situations.

▶ Use only hoses which are authorised for the indicated pressure and temperature range.

▶ Observe the data sheet specifications from the hose manufacturers.

The operation of the diaphragm control valve Type 2730, 2731 and 2731 K is possible only in combination with an control unit.

Possible control units are: Positioner Type 8635, 8692, 8694, 8792 Process controller Type 8693, 8793

Observe the type label.

The pneumatic connection of the control unit is described in the respective operating instructions for the control unit.

7.3.1 connectionoftheactuator

controlfunctionsa:

→ Connect the control medium to the lower pilot air port of the actuator (see “Fig. 17: Pneumatic connection”)

controlfunctionsB:

→ Connect the control medium to the upper pilot air port of the actuator (see “Fig. 17: Pneumatic connection”)

Silencer For reducing the exhaust air noise: plug the silencer into the free air discharge connection (see “Fig. 17: Pneumatic connection”)

If used in an aggressive environment, we recommend conveying all free pneumatic connections into a neutral atmosphere with the aid of a pneumatic hose.



Fig. 17: Pneumatic connection

controlairhose:

Control air hoses of sizes 6/4 mm or 1/4“ can be used.

20

Installation

english

Type 2730, 2731 and 2731 K

8 remOVal

Danger!

riskofinjuryfromdischargeofmediumandpressure.

It is dangerous to remove a device which is under pressure due to the sudden release of pressure or discharge of medium.

▶ Before removing a device, switch off the pressure and vent the lines.

→ Loosen the pneumatic connection. → Remove the device.

note!

deformationofthediaphragm. ▶ For prolonged storage of the valves, slacken the housing screws.

9 elecTricalcOnTrOluniTThe valve Type 2730, 2731 and 2731K can be combined with fol-lowing control units:

• Type 8635 Positioner SideControl

• Type 8692 Positioner TopControl

• Type 8694 Positioner TopControl Basic

• Type 8792 Positioner SideControl

• Type 8693 Process controller TopControl

• Type 8793 Process controller SideControl

The electrical connection of the control unit is described in the respective operating instructions for the control unit.

21

Removal

english

Type 2730, 2731 and 2731 K

10 malfuncTiOns

malfunction cause/remedialaction

Actuator does not switch

Pilot air port interchanged4)

CFA: Connecting lower pilot air port

CFB: Connecting upper pilot air port

Pilot pressure too low See pressure specifications on the type label.

Medium pressure too high See pressure specifications on the type label.

Valve is not sealed

Medium pressure too high See pressure specifications on the type label.

Pilot pressure too low See pressure specifications on the type label.

Flow rate reduced

PTFE diaphragm bulging

→ Replace diaphragm.Tab. 11: Malfunctions

4) see “Fig. 17: Pneumatic connection”

11 mainTenance

Danger!


riskofinjuryduetoelectricalshock. ▶ Before reaching into the system, switch off the power supply and secure to prevent reactivation!

▶ Observe applicable accident prevention and safety regulations for electrical equipment!

Warning!

riskofinjuryfromimpropermaintenance. ▶ Installation may be carried out by authorized technicians only and with the appropriate tools!

riskofinjuryfromunintentionalactivationofthesystemandanuncontrolledrestart.

▶ Secure system from unintentional activation. ▶ Following maintenance, ensure a controlled restart.

11.1 maintenanceandcleaning

11.1.1 actuator

The actuator of the diaphragm control valve is maintenance-free provided it is used according to these operating instructions.

22

Malfunctions

english

Type 2730, 2731 and 2731 K

11.1.2 Wearingpartsofthediaphragmcontrolvalve

Parts which are subject to natural wear:

• Seals

• Diaphragm

→ If leaks occur, replace the particular wearing part with an appro-priate spare part (see chapter “12 Replacement parts”).

A bulging PTFE diaphragm may reduce the flow.

The replacing of the wearing parts is described in chapter “11.2”.

11.1.3 inspectionintervals

The following maintenance work is required for the diaphragm valve:

→ After the first steam sterilization or when required retighten body screws crosswise.

→ After maximum 105 switching cycles check the diaphragm for wear.

Muddy and abrasive media require correspondingly shorter inspection intervals!

11.1.4 servicelifeofthediaphragm

The service life of the diaphragm depends on the following factors:

• Diaphragm material

• Medium, medium pressure, medium temperature

• Actuator size

• Pilot pressure for CFB.

protectingthediaphragm

→ For CFA match the actuator size (actuator force) to the medium pressure to be actuated. If required, select the actuator with reduced spring force EC04.

→ For CFB try and select the pilot pressure not higher than is required to actuate the medium pressure.

11.1.5 cleaning

Commercially available cleaning agents can be used to clean the outside.

note!

avoidcausingdamagewithcleaningagents. ▶ Before cleaning, check that the cleaning agents are compatible with the body materials and seals.

23

Maintenance

english

Type 2730, 2731 and 2731 K

11.2 replacingthediaphragm

Danger!

riskofinjuryfromdischargeofmediumandpressure.

It is dangerous to remove a device which is under pressure due to the sudden release of pressure or discharge of medium.

▶ Before removing a device, switch off the pressure and vent the lines.

fasteningtypes

Orifice(Diaphragm size)

[mm]

fasteningtypesfordiaphragms

ptfe epdm/fkm

15 Diaphragm with bayonet catch

Diaphragm with bayonet catch20

25Diaphragm with bayonet catch

Diaphragm screwed in40

50

Tab. 12: Fastening types for diaphragms

replacementforcontrolfunctiona

→ Clamp the valve body in a holding device (applies only to valves not yet installed).

notiCe!

damagetothediaphragmortheseatcontour! ▶ When removing the actuator, ensure that the valve is in open position.

→ Pressurize lower pilot air port of the actuator with compressed air (5 bar): valve opens.

→ Loosen the four body screws. → Remove the actuator from the body. → Unbutton or unscrew old diaphragm. If attachment is with a bayonet catch, remove the diaphragm by rotating it through 90°. For orifice DN25-DN50 observe chapter “11.2.1”.

→ Install new diaphragm. → Align diaphragm. themarkerflapofthediaphragmmustbeperpendiculartothedirectionofflow(see “Fig. 18”)!

→ Place actuator back on the body. → Insert the body screws and lightly cross-tighten until the dia-phragm is between the body and actuator. donottightenthescrewsyet.

→ Actuate the diaphragm control valve twice. → Without pressurization tighten the body screws to the per-mitted tightening torque (see “Tab. 13: Tightening torques for diaphragms”).

24

Maintenance

english

Type 2730, 2731 and 2731 K

Actuator

Valve body



Body screws (4x)

Diaphragm

Marker flap of the diaphragm

Fig. 18: Repairs

replacementforcontrolfunctionsB

→ Clamp the valve body in a holding device (applies only to valves not yet installed).

→ Loosen the four body screws. → Remove the actuator from the body. → Unbutton or unscrew old diaphragm. If attachment is with a bayonet catch, remove the diaphragm by rotating it through 90°. For orifice DN25-DN50 observe chapter “11.2.1”.

→ Install new diaphragm. → Align diaphragm. themarkerflapofthediaphragmmustbeperpendiculartothedirectionofflow(see “Fig. 18”).

→ Place actuator back on the body. → Lightly cross-tighten the body screws without pressurization until the diaphragm is between the body and actuator. donottightenscrewsyet.

→ Pressurize upper pilot airport of the actuator with compressed air (5 bar) (see “Fig. 18”).

→ Actuate the diaphragm control valve twice. → With pressurization tighten the body screws to the per-mitted tightening torque (see “Tab. 13: Tightening torques for diaphragms”).

Orificedn(diaphragm

size)

tighteningtorquesfordiaphragms[nm]

epdm ptfe

15 3.5 4

20 4 4.5

25 5 6

32 6 8

40 8 10

50 12 15

Tab. 13: Tightening torques for diaphragms

25

Maintenance

english

Type 2730, 2731 and 2731 K

11.2.1 switchbetweenpTfeandepDmdiaphragms

Orificedn15anddn20:

→ Loosen PTFE diaphragm bayonet and attach new EPDM diaphragm.Orificedn25uptodn50:

→ Loosen PTFE diaphragm bayonet. → Place the insert in the pressure piece. → Insert and screw in EPDM diaphragm.

12 replacemenTparTs

Caution!

riskofinjuryand/ordamagebytheuseofincorrectparts.

Incorrect accessories and unsuitable replacement parts may cause injuries and damage the device and the surrounding area.

▶ Use only original accessories and original replacement parts from Bürkert.

The diaphragm is available as a replacement part for the piston-con-trolled diaphragm control valve Type 2730, 2731 and 2731K.

If you have any queries, please contact your Bürkert sales office.

Diaphragm

Fig. 19: Diaphragm replacement part

26

Replacementparts

english

Type 2730, 2731 and 2731 K

12.1 OrdertableOrifice

(Diaphragm size)[mm]

Ordernumbersfordiaphragms

epdm(aB*)

epdm(ad*)

fkm(ff*)

15 677 664 E02** 688 422 E03** 677 685 F01**

15 BC** 693 162 E02** 693 163 E03** 693 164 F01**

20 677 665 E02** 688 423 E03** 677 686 F01**

20 BC** 693 165 E02** 693 166 E03** 693 167 F01**

25 677 667 E01** 688 424 E03** 677 687 F01**

32 677 668 E01** 688 425 E03** 677 688 F01**

40 677 669 E01** 688 426 E03** 677 689 F01**

50 677 670 E01** 688 427 E03** 677 690 F01**

ptfe(ea*)

advancedptfe(eu*)

laminatedadvancedptfe

(et*)

15 677 675 E02- PTFE**

679 541 E02- PTFE+ Hole**

677 695 L02**

20 677 676 E02- PTFE**

679 542 E02- PTFE+ Hole**

677 696 L02**

25 677 677 E02- PTFE**

679 543 E02- PTFE+ Hole**

677 697 L01**

32 677 678 E02- PTFE**

679 544 E02- PTFE+ Hole**

–

40 677 679 E02- PTFE**

679 545 E02- PTFE+ Hole**

677 698 L01**

50 677 680 E02- PTFE**

679 546 E02- PTFE+ Hole**

677 699 L01**

Tab. 14: Order numbers for diaphragms

* SAP Code

** Identification on the diaphragm

27

Replacementparts

english

Type 2730, 2731 and 2731 K

13 pacKaging,TranspOrT,sTOrage

note!

transportdamages.

Inadequately protected equipment may be damaged during transport.

• During transportation protect the device against wet and dirt in shock-resistant packaging.

• Avoid exceeding or dropping below the permitted storage temperature.

incorrectstoragemaydamagethedevice.

• Store the device in a dry and dust-free location.

• Storage temperature -20 – +65 °C.

damagetotheenvironmentcausedbydevicecomponentscontaminatedwithmedia.

• Dispose of the device and packaging in an environmentally friendly manner.

• Observe applicable regulations on disposal and the environment.

note:

Observe national waste disposal regulations.

28

Packaging,transport,storage

english

Type 2730, 2731 and 2731 K

www.burkert.com

Documents

Type 2730, 2731, 2731 K - burkert-usa.com...2731 and 2731 k may be a hazard to people, nearby equipment and the environment. The device is designed for the controlled flow of liquid